Patterns in morphological variability have been the main basis for conventional geneticÂ improvement program, particularly in selective breeding. Proper understanding onÂ these patterns hence, is of crucial prerequisite before any scheme of breedingÂ program is undertaken. This study was aimed to explore those morphological variationsÂ with emphasis on the assessment of among-population and among-trait variationsÂ and assessment of predictive traits that may serve for inter-population differentiation.Â A total 281 individuals representing four natural populations (Asahan, Ogan, Barito,Â and Ciasem) and one domesticated stock (GIMacro) were sampled and analyzed forÂ variability in thirteen morphological traits. While descriptive analyses were appliedÂ to analyze both among-stock and among-trait variations, discriminant function analysisÂ was used to search for the best traits for interpopulation differentiation. The relativeÂ variability, expressed in the coefficient of variation (CV), was used to compare theÂ amount and patterns of morphometric variability both among traits and betweenÂ stocks. Results showed that total body weight was the most variable trait while theÂ length and meristic traits were of lower level. Discriminant analysis found that rostrumÂ length and abdoment length to be the best morphological discriminators amongÂ intraspecific populations. However, the continuous natures of these traits makeÂ them have limited applicability for intraspecific population differentiation.
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